Ion Cyclotron Diffusion of Velocity Distributions in the Extended Solar Corona

Details Ion Cyclotron Diffusion of Velocity Distributions in the Extended Solar Corona Ion Cyclotron Diffusion of Velocity Distributions in the Extended Solar Corona

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000agufmsh21b..09c&link_type=abstract

American Geophysical Union, Fall Meeting 2000, abstract SH21B-09

Physics

Scientific paper

The UVCS instrument aboard SOHO has revealed strong kinetic anisotropies and extremely large perpendicular temperatures of minor ions in the extended solar corona. These observations have given rise to several new theoretical models of particle energization via resonance with ion cyclotron Alfven waves. The analysis of the UVCS emission line profiles, though, has only been performed under the assumption of simple two-temperature bi-Maxwellian velocity distribution functions. This presentation investigates some of the consequences of departures from bi-Maxwellians, and treats the problem of ion cyclotron diffusion in velocity space using the standard quasi-linear approximation. A case will be made for the possibility that this diffusion acts on time scales of same order as the solar wind expansion time (and not on much shorter time scales as is often assumed). The distortion of ion velocity distributions along curved "shells" in velocity space will be explored, and the approach to marginal stability in the linear damping rates is found to be much more accurately portrayed than when using bi-Maxwellian distributions. The shapes and strengths of ultraviolet emission line profiles are also affected by departures from bi-Maxwellian distributions, and the possible impact on UVCS/SOHO data analysis will be discussed.

Affiliated with

Also associated with

No associations

Rating

Ion Cyclotron Diffusion of Velocity Distributions in the Extended Solar Corona does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Ion Cyclotron Diffusion of Velocity Distributions in the Extended Solar Corona, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ion Cyclotron Diffusion of Velocity Distributions in the Extended Solar Corona will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1730211